Abrasive type roof coating apparatus



Aug. 1, 1965 A. o. JUTILA 3,203,631

ABRAS IVE TYPE ROOF COATING APPARATUS Filed May 18, 1964 2 Sheets-Sheet 1 x. FIQEJ.

INVENTOR. 4: EX 0. Jar/L4 A l: Arranusrs- Aug. 31, 1965 A. o. JUTILA ABRASIVE TYPE ROOF COATING APPARATUS 2 Sheets-Sheet 2 Filed May 18, 1964 INVENTOR. AL 5 X 0- JUf/LA I: ,4z'raR United States Patent 3,203,631 ABRASIVE TYPE ROOF COATING APPARATUS Alex 0. Jutila, '5062 Zion, San Diego, Calif. Filed May '18, 1964, Sen No.368,15 3 Claims. (Cl. 239-424) The present invention relates to the mixing and transferring of liquids, and pertains more particularly to a mechanism for mixing and applying abrasive type cementitious roof coating material.

In applying abrasive type cementitious roof coating material to either new or old roof it is common practice to employ one or more men with a mixing machine on the ground to mix and load the material into bucket type elevators, which are then hauled to the roof level where two or more men on the roof apply this coating by means of swabs and buckets. Such coating material is usually applied over built up rock roofing, wherein fine gravel or crushed rock is applied over hot asphalt coated tarred felt, or over 90 pound mineral coated cap sheet.

An object of the present invention is to provide an improved and simplified mechanism for applying cementitious roof coating wherein, if necessary, one man can perform an entire roof coating operation, and can do it with less effort and at greater speed than even a full crew of men by current standard procedures.

An object of the invention is to provide an improved, one hose mechanism for applying cementitious roof coating material to roofs.

Another object of the invention is to provide a power driven mechanism for mixing and maintaining agitated a quantity of cementitious roof coating material, and for feeding such material under pressure through a high pressure hose line of suflicient length to reach a required area of the roof of a building to be coated, an applicator nozzle with means for controlling discharge of the material therethrough being provided.

Another object of the invention is to provide an improved and simplified mechanism for applying abrasivecontaining liquid roof coating material to the roofs of buildings.

These, and other objects and advantages of the invention, will be apparent from the following description and the accompanying drawings, wherein:

FIG. 1 is a perspective view showing a mechanism embodying the invention.

FIG. 2 is an enlarged, vertical transverse sectional view through the mechanism shown in FIG. 1, taken through the discharge opening from the tank, portions being broken away, the lid being shown in broken lines in partially raised condition.

FIG. 3 is a similarly enlarged, fragmentary, perspective view showing portions of the tank, agitating rotor and discharge line.

FIG. 4 is a perspective view showing the upper portion of the mixing tank with the cover open, and showing the grid shelf for supporting an aggregate bag when charging the machine with aggregate.

FIG. 5 is a sectional view of the mechanism taken as along line 55 of FIG. 2, the hose being broken away.

FIG. 6 is a fragmentary sectional view of the upper rear corner portion of the mixing tank, the cover being shown in open condition in broken lines.

Briefly, an illustrative roof coating mechanism A embodying the invention comprises a tank 10 supported on a castered base frame 11 having a suitable power supply such as a small gasoline engine 12 mounted therein. The engine 12 drives a shaft 13 having a pump 14 connected thereto, and also drives an agitator shaft 15 having a paddle type agitator 17 thereon. Resilient wiper plates 18 are mounted on the agitator 17 to keep clear a grating 3,203,631 Patented Aug. 31, 1965 19 covering the upper end of a discharge line 20 from the tank 10. The pump 14 forces fluent roofing material from the tank 10 into a hose 21, a pressure controlled by-pass 22 returning excess roofing material to the tank. The roofing material travels through the hose 21 to a manually controlled valve 23, which controls the flow of the material through a discharge nozzle 24 onto a roof.

Referring to the drawings in greater detail the mixing tank 10 may be of any suitable material, such as, for example, sheet steel, of suitable strength and stiffness, and which may be stainless. The tank 10 has a semi-cylindrical bottom portion 10a, and preferably is of a size to hold enough roofing material, for example 60 to gallons, to cover several hundred square feet of roof. The tank 10 is provided with a hinged cover 27, and a perforate shelf 28, which may be of expanded metal as illustrated in FIG. 4, is mounted a short distance below the cover. The shelf 28 is of sufiicient strength and rigidity to support without permanent distortion an pound bag of abrasive material such as cement when the latter is dropped thereon from a height of approximately a foot.

The agitator shaft 15 is journaled in bearings 29 and 30 mounted co-axially of the cylindrical tank bottom portion 100. The bearing 29 is of sealed cup-shape, while the bearing 30 is provided with a conventional packing gland 31. Both bearings 29 and 30 are provided with suitable greasing means, such as for example grease cups 32. A pair of hub members 33, each having a pair of integral, diametrically oppositely extending arms 34 and 35, are mounted on the shaft 15 just inwardly of the ends of the tank 10. Paddle blades 37 and 38 are mounted on the outer ends of each oppositely extending pair of arms 34 and 35, respectively, these paddle blades being positioned to clear the cylindrical tank bottom 10a during rotation of the agitator so as to avoid excessive abrasion of the tank bottom.

To each of the agitator blades is secured one of the resilient wiper plates 18, which may be of tough, resilient material, such as, for example, rubber or neoprene of the order of A inch in thickness. These wiper plates are positioned to wipe across the grating 19 provided over the funnel-shaped entrance 39 to the discharge line 20 from the tank 16, the flow through which line is controlled by a conventional shut off cock 40.

The line 20 communicates with the inlet side of the pump 14, which is illustrated as being of a well known helical rotor type with resilient housing. The specific type of pump employed is not, however, a feature of the invention, provided it is capable of pumping at suitable pressure the particular fluent roofing mixture employed.

The pump 14 has its shaft 14a sealed by a conventional packing gland 41, and the drive shaft 13 is coupled coaxially to the pump shaft. A grooved pulley 42 is mounted on the drive shaft 13 and is driven by a conventional V-belt 43 from the illustrated power source comprising the engine 12. The grooved pulley 44 is also provided on the outer end of the drive shaft 13, and drives a V-belt 45, which is also passed around a pulley 47 on the agitator shaft 15 to drive the latter.

From the discharge outlet of the pump 14 a pipe 48 is connected to a T-fitting 49, and a conventional pressure gauge 50 is mounted in the pipe 48 to indicate the outlet pressure from the pump. The by-pass line 22 extends from the side outlet of the T-fitting 49 to a pressure regulator valve 51, which communicates with the interior of the tank through a pipe 52.

From the other end of the T-fitting 49 a pipe 53 communicates through a shut-off cock 54 with the hose 21, which is of conventional high pressure type, and which conducts the material to the roof of a building being treated. The hose 21 obviously must be of sufficient length to extend from the machine to all parts of a roof area to be coated.

A second shut-off cock 55 is mounted on the other end of the hose 21, and is connected to the control valve 23, which, as illustrated, is of conventional, spring biased, grip-actuated type having a rigid tube 57 connected to its outlet end. The nozzle 24 on the outer end of the tube 57 is of a type to discharge the material therefrom, preferably in the form of a cone-shaped spray. The specific type of control valve and nozzle employed are not material to the invention, and since numerous suitable valves and spray nozzles are available on the open market the details thereof are omitted.

In using the mechanism A, with the engine 12 operating to drive the pump 14 and agitator 17, and with the main shut-off cock closed, a suitable quantity of liquid, such as, for example, water, may be poured into the tank It) upon opening the cover 27. A bag (not shown) containing a suitable quantity of abrasive, such as, for example, Portland cement, is then placed on the grid 19 and is opened, as by cutting the bag with the blade of a shovel, and allowed to gravitate through the grating 19 into the liquid in the tank. The agitator blades 37 thoroughly mix the aggregate material into the liquid in the tank, the resilient wiper plates 18 keeping the discharging grating 19 free from an accumulation of the aggregate particles.

Upon opening the main cock 49, the mixture of abrasive-containing liquid gravitates, and is drawn by the action of the pump 14, down through the discharge line 20 from the tank 19 into the pump 14, the impeller 58 of which is being rotated by the engine 12. The mixture is forced through the pump and out through the outlet pipe 48. If the shut-off cock 54 is closed, the material is forced upwardly through the by-pass line 22, and, when the pressure exceeds the closing bias of the pressure actuated valve 51, through the latter and back into the tank through the pipe 52.

Upon opening the shut-off cocks 54 and 55, then depressing the hand control lever 23a of the valve 23, the mixture is forced through the hose 21 and out through the nozzle 24, whence it emerges in a pressurized spray pattern. The shape of the spray pattern is determined by the type and adjustment of the specific nozzle employed, and the volume is controlled by regulating the spring loading on the bypass valve, and adjusting the speed of the engine. The nozzle 24 is directed toward the roof, and is moved back and forth thereover as required to apply the material in an even coating thereon.

Upon completion of the job, or at least before stopping the machine, any excess material is removed from the tank 10 through a drain outlet 59 provided for this purpose, the engine being kept running during the draining and cleaning operation to prevent the settling out of the aggregate. A quantity of liquid, for example water, is then run into the tank 10 after closing oh the drain outlet 59, and this liquid is pumped through the hose 21 and nozzle .24 to thoroughly clean the interior of all lines. During this cleaning operation the valve 23 is allowed to close from time to time to allow the cleaning liquid to also flow through the by-pass line 22 and the pressure actuated valve 51.

Various other types of cementitious or abrasive type roof coating materials can be employed, such as, for example, that sold under the trademark Alumination 301 by Republic Powdered Metals Co. Obviously, when a material is employed which is not water soluble, a suitable solvent will be employed to flush out the tank and lines after each use. After flushing out the tank and lines, the tank may be drained through the drain outlet 59, and is then ready for reuse when required.

The invention provides a simple and highly effective one-line applicator for abrasive type cementitious roof coating material. It also permits a roof coating operation to be performed in much less time, with much less expense, and in a more effective and satisfactory manner than has been possible by prior practices.

While I have illustrated and described a preferred embodiment of the present invention, it will be understood, however, that various changes and modifications may be made in the details thereof without departing from the scope of the invention as set forth in the appended claims.

Having thus described the invention, what 1 claim as new and desire to protect by Letters Patent is defined in the following claims.

1. A single line applicator for abrasive type liquid roofing material, said applicator comprising a tank having a cylindrical bottom,

an agitator mounted for rotation co-axially of the cylindrical tank bottom,

a plurality of blades mounted on the agitator for rotation therewith, the outward edge of each blade being spaced slightly from the cylindrical tank bottom during rotation of the agitator,

a flexible wiper blade mounted on each agitator blade and extending outwardly therefrom for wiping contact with a portion of the cylindrical tank bottom,

a discharge line from the bottom of the tank in the path of the wiper blades,

a grating covering the inlet end of the discharge line and positioned for wiping engagement by each of the wiper blades during rotation of the agitator,

a pump having its inlet connected to the discharge line from the tank,

power drive means operatively connected to drive the agitator and the pump,

a single hose line connected to the outlet of pump, the hose line being of a length to extend to all parts of a roof area to be coated,

a discharge nozzle at the outlet end of the hose for discharging material pumped from the tank through the hose,

valve means controlling the discharge of material from the nozzle,

a bypass line adjacent the discharge end of the pump for by-passing material from the discharge line from the pump back into the tank, and

spring biased valve means in the by-pass line for controlling the pressure at which material flows from the pump through the by-pass line and back into the tank.

2. A single line applicator for abrasive type liquid roofing material, said applicator comprising a tank having a cylindrical bottom,

an agitator mounted for rotation co-axially of the cylindrical tank bottom, and spaced radially at inwardly therefrom,

a flexible wiper blade mounted on the agitor and extending radially therebeyond into wiping contact with a portion of the cylindrical tank bottom,

a discharge line from the bottom of the tank in the path of the wiper blade,

a grating covering the inlet end of the discharge line and positioned for wiping engagement by the wiper blade during rotation of the agitator,

a pump having its inlet connected to the discharge line from the tank,

power drive means operatively connected to drive the agitator and the pump,

a single hose line connected to the outlet of pump, the hose line being of a length to extend to all parts of a roof area to be coated,

a discharge nozzle at the outlet end of the hose for discharging material pumped from the tank through the hose,

valve means controlling the discharge of material from the nozzle, and

spring biased valve means for controlling the pressure at which material flows from the pump to the nozzle.

3. A single line applicator for abrasive type liquid roofing material, said applicator comprising a tank having a cylindrical bottom a perforated shelf adjacent the top of the tank to receive and support a bag of abrasive material for mixing with liquid contained in the tank,

an agitator mounted for rotation within the tank, below the shelf and co-axially of the cylindrical tank bottom, and spaced radially inwardly from the tank bottom,

a flexible Wiper blade mounted on the agitator and extending radially therebeyond into wiping contact with a portion of the cylindrical tank bottom,

a discharge line from the bottom of the tank in the path of the wiper blade,

a grating covering the inlet end of the discharge line and positioned for wiping engagement by the Wiper blade during rotation of the agitator,

a pump having its inlet connected to the discharge line from the tank,

power drive means operatively connected to drive the agitator and the pump,

a single hose line connected to the outlet of pump, the hose line being of a length to extend to all parts of a roof area to be coated,

a discharge nozzle at the outlet end of the hose for discharging material pumped from the tank through the hose,

valve means controlling the discharge of material from the nozzle, and

spring biased valve means for controlling the pressure at which material flows from the pump to the nozzle.

References Cited by the Examiner UNITED STATES PATENTS 455,463 6/91 Pratt 239126 2,580,551 1/52 Kacena 259-178 2,596,074 5/52 Hawes 239127 2,618,576 11/52 Brown et al 259161 2,880,976 4/59 True 239124 2,976,025 3/61 Pro 259-478 EVERETT W. KIRBY, Primary Examiner. 

1. A SINGLE LINE APPLICATOR FOR ABRASIVE TYPE LIQUID ROOFING MATERIAL, SAID APPLICATOR COMPRISING A TANK HAVING A CYLINDRICAL BOTTOM, AN AGITATOR MOUNTED FOR ROTATION CO-AXIALLY OF THE CY LINDRICAL TANK BOTTOM, A PLURALITY OF BLADES MOUNTED ON THE AGIATOR FOR ROTATION THEREWITH, THE OUTWARD EDGE OF EACH BLADE BEING SPACED SLIGHTLY FROM THE CYLINDRICAL TANK BOTTOM DURING ROTATION OF THE AGIATOR, A FLEXIBLE WIPER BLADE MOUNTED ON EACH AGITATOR BLADE AND EXTENDING OUTWARDLY THEREFROM FOR WIPING CONTACK WITH A PORTION OF THE CYLINDRICAL TANK BOTTOM, A DISCHARGE LINE FROM THE BOTTOM OF THE TANK IN THE PATH OF THE WIPER BLADES, A GRATING COVERING THE INLET END OF THE DISCHARGE LINE AND POSITIONED FOR WIPING ENGAGEMENT BY EACH OF THE WIPER BLADES DURING ROTATION OF THE AGITATOR, A PUMP HAVING ITS INLET CONNECTED TO THE DISCHARGE LINE FROM THE TANK, POWER DRIVE MEANS OPERATIVELY CONNECTED TO DRIVE THE AGIATOR AND THE PUMP, A SINGLE HOSE LINE CONNECTED TO THE OUTLET OF PUMP, THE HOSE LINE BEING OF A LENGTH TO EXTEND TO ALL PARTS OF A ROOF AREA TO BE COATED, A DISCHARGE NOZZLE AT THE OUTLET END OF THE HOSE FOR DISA CHARGING MATERIAL PUMPED FROM THE TANK THROUGH THE HOSE, VALVE MEANS CONTROLLING THE DISCHARGE OF MATERIAL FROM THE NOZZLE, A BY-PASS LINE ADJACENT THE DISCHARGE END OF THE PUMP FOR BY-PASSING MATERIAL FROM THE DISCHARGE LINE FROM THE PUMP BACK INTO THE TANK, AND SPRING BIASED VALVE MEANS IN THE BY-PASS LINE FOR CONTROLLING THE PRESSURE AT WHICH MATERIAL FLOWS FROM THE PUMP THROUGH THE BY-PASS LINE AND BACK INTO THE TANK. 